Internal Speakers Problem

Hi,
I am helping my sister diagnose a problem with her macbook. It is an '07 model.
Using screen share I determined there appears to be a software 'gliche' that prevents her mac from ID-ing the built in speakers and sending output to them. If she plugs in headphones, she can hear music, etc, but without, nothing, indicating the sound card is working properly.
I've gone through the obvious list of troubleshooting, no mute, etc. Most interesting is when I compare her system preferences to mine and do not have external speakers connected, mine shows in the sound menu "internal speakers" while hers shows nothing.
I've taken a screenshot of her system preferences. Link: http://filebox.vt.edu/users/kmtchll/Picture%202.png
If anyone has suggestions on this please let me know or [email protected]

There is a switch inside the MacBooks audio out jack which is malfunctioning in your sister's MacBook. There will be a red light showing inside her audio out jack if I am correct. The purpose of the switch is to tell the MacBook whether to send analog audio or digital optical audio. Your preference panel says that the MacBook is only ready to send digital audio, due to the stuck switch
This can sometimes be corrected by fiddling with a toothpick in the jack or sometimes by just plugging and unplugging a plug.

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I wanted to know if anyone have experienced a problem with internal speakers of Mac Book Pro. In my MackBook the Internal speaker volume goes down automatically. I checked the System Preferences>Sound>Output , from there I check that it is in the middle ( Balance) However, the problem is still the exists. Just for testing I played an audio file and I moved the bar toward the right speaker it is the same and when I move toward the left speaker the whole sound goes off . Looks like one speaker stops working completely. Then I checked the Utilities > Audio MIDI Setup > Configure Speakers from there I checked both left and right speakers and the channel frequency is fine. Still same issue. I have no idea what is going on , I really need your suggestions to get this fixed.
Thanks in advance.

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Blade,
It could be the speakers have a pinched wire causing a short, so the suggestion from the support specialist could be a good suggestion.
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Download and install the latest BIOS version 1.60 (J4ET60WW), or newer, from the Lenovo eSupport website:
BIOS Windows Update Utility version 1.60:
http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS037206
BIOS ISO CD Update Tool version 1.60:
http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS037264
ThinkPads: S30, T43, X60t, X1, W700ds, IdeaPad Y710, IdeaCentre: A300, IdeaPad K1
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